diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index ef534c5c6f..279445eb58 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -26,14 +26,14 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Cache conda
-        uses: actions/cache@v3
-        env:
-          CACHE_NUMBER: 0
-        with:
-          path: ~/conda_pkgs_dir
-          key:
-            ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('ci/environment.yml') }}
+#      - name: Cache conda
+#        uses: actions/cache@v3
+#        env:
+#          CACHE_NUMBER: 0
+#        with:
+#          path: ~/conda_pkgs_dir
+#          key:
+#            ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('ci/environment.yml') }}
 
       - uses: conda-incubator/setup-miniconda@v2
         with:
@@ -405,6 +405,7 @@ jobs:
             bison=3.4
             symengine=0.12.0
             sympy=1.11.1
+            zstd=1.5.6
 
       - uses: hendrikmuhs/ccache-action@main
         with:
diff --git a/ci/environment.yml b/ci/environment.yml
index b9b7fd715f..4fcd733601 100644
--- a/ci/environment.yml
+++ b/ci/environment.yml
@@ -4,19 +4,20 @@ channels:
   - defaults
 dependencies:
   - llvmdev=11.1.0
-  - toml
-  - pytest
-  - jupyter
+  - toml=0.10.2
+  - pytest=7.2.0
+  - jupyter=1.0.0
   - xeus=1.0.1
-  - xtl
-  - nlohmann_json
-  - cppzmq
-  - jupyter_kernel_test
-  - xonsh
-  - re2c
-  - numpy
+  - xtl=0.7.4
+  - nlohmann_json=3.9.1
+  - cppzmq=4.7.1
+  - jupyter_kernel_test=0.4.4
+  - xonsh=0.13.3
+  - re2c=2.2
+  - numpy=1.23.4
   - zlib
-  - ninja
-  - rapidjson
+  - zstd
+  - ninja=1.11.0
+  - rapidjson=1.1.0
 #  - bison=3.4  [not win]
 #  - m2-bison=3.4  [win]